V2: start moving a basic component and rendering footer

[SamyPesse]

The current strategy for migration will be:

• Move leaf components and utilities to v2, importable in v1 using @v2/...
• Replace use of global functions that access headers() in v1 by a context being passed as props

[changeset-bot]

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Latest commit: d3d240c

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[github-actions]

Summary of the deployments:

Version 1 (production)

Version	URL	Status
Latest commit		❌
PR		❌

Version 2 (experimental)

Version	URL	Status
Vercel		❌
Cloudflare		❌

Test content

Site	v1	v2
GitBook	/docs.gitbook.com	/static/url/docs.gitbook.com
E2E	/gitbook.gitbook.io/test-gitbook-open	/static/url/gitbook.gitbook.io/test-gitbook-open